Calvin Klein, Marc Jacobs and Chevrolet recruited the most celebrities in 2015

From Bieber's briefs to Olivia Wilde playing professor for a day, this year has seen marketers scramble to sign up celebrities.

With 29 A-list ambassadors, Calvin Klein was the most endorsed brand of 2015, according to research conducted by engagement platform Celebrity Intelligence.

The company has inked several new endorsement deals over the past twelve months and names such as Lara Stone and Kendall Jenner (who was recently named the most in-demand face for brands this year), managed to get in on the underwear designer's #MyCalvins campaign.

Celebrity Intelligence monitors brand partnership deals year-round and collated the data from its 50,000 celebrity profiles.

1. Calvin Klein

Taking the top spot was Calvin Klein. The brand's #MyCalvins drive earned it a lot of celebrity support and the controversial appointment of Justin Bieber was a massive success for the Manhattan-based firm. Bieber clocked up over 3.6 million extra followers in the days following the release of the spot and the campaign's hashtag generated 1.6 million mentions. Kendall Jenner, Lara Stone and Kourtney Kardashian also starred in promotions for the designer.

2. Marc Jacobs

With 20 celebrity ambassadors Marc Jacobs stole second place. The fashion-house enlisted a host of stars (and their children) to front its fall/winter campaign. A variety of A-listers including Willow Smith, Cher and Debi Mazar partnered with the retailer.

3. Chevrolet

The cast of @Disney’s #Tomorrowland is ready for the future with the #NextGenVolt. Are you? A photo posted by chevrolet (@chevrolet) on

Close behind is Chevrolet which has worked with 19 celebrities over the past 12 months. As an alternative to April Fools’ Day, the automaker enlisted a number of famous faces to help people across the US have the #BestDayEver. Events included Olivia Wilde turning professor for the day for an unsuspecting class and Helio Castroneves surprising people with a free lunch.

4. Air New Zealand

From our #squad to yours, huge congratulations to the @allblacks. #CrazyAboutRugby A photo posted by Air New Zealand (@airnz) on

Famous for its star-studded in-flight safety videos, Air New Zealand stole the fourth spot. To celebrate the rugby world cup taking place in September it tapped a number of rugby stars past and present and racked up 17 deals.

5. Action/2015

Pressure group Action/2015 nabbed fifth place. The organisation called on world leaders to set the bar higher on combating climate change and courted names such as Leonardo DiCaprio, Mark Ruffalo, One Direction and Cate Blanchett in the process.

6.H&M

Thanks to a holiday campaign starring Katy Perry, a deal with Foxes to front its Divided collection and 14 other partnerships, retailer H&M scored sixth place on the list.

7. Chipotle

Chipotle has given free-burrito cards to several pro-athletes including NBA’s Mario Chalmers and skateboarder Tony Hawk, racking up a total of 15 a-list ambassadors over the past 12 months.

8. The Make it Fair Project

The Make it Fair Project calls for gender equality across all aspects of life. Rita Wilson, Alice Kremelberg and Jessica Hecht were just some of the household names who joined forces with other female entertainers to highlight the cause earlier this year.

9. Beats by Dr. Dre

Two wasn’t enough. Listen to the @losangelesconfidential on @AppleMusic: beats.is/Documentary2Pt2 A photo posted by Beats By Dre (@beatsbydre) on

Kylie Jenner, Tyga and Dr. Dre himself have all starred in campaigns for the Apple-owned brand this year, which inked 13 deals with stars in total.

10. Coca-Cola

Last but not least, partnerships with faces like Rosie Huntington-Whiteley saw Coca-Cola come in at number 10.

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